Corss Recessed Flange Head Self-Tapping Screws [Table 19]
BS 4174 - 1972 米字槽扁头凸缘（华司）自攻钉 [Table 19]
See all versions and complete specifications: Corss Recessed Flange Head Self-Tapping Screws [Table 19] — Full Specification Page
| Size | P | e | r | k_max | k_min | s_max | s_min | ds_max | ds_min | k_nominal | ds_nominal |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 4# | 8.15 | 2 | 3.71 | 0.71 | 0.56 | 7.7 | 1.88 | 2.13 | 1.68 | 1.57 | 4.85 |
| 6# | 11.38 | 2 | 4.47 | 0.91 | 0.71 | 10.8 | 2.9 | 2.92 | 2.46 | 2.51 | 6.68 |
| 8# | 14.55 | 3 | 6.73 | 1.17 | 0.96 | 13.87 | 3.68 | 4.04 | 3.58 | 3.25 | 9.47 |
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